Filter-press.



No. 652,588. Patented June 26, I900. M. P. BDAG.

FILTER PRESS.

(Application filed Nov. 15, 1899.)

del.)

I Z WITNESSES 2 [N VEN TOR.

' y Wham 6017 UNITE STATES more.

MATTHEW P. BOAG, OF GOLDEN GATE, CALIFORNIA, ASSIGNOR TO HIMSELF, AND CHARLES V. MANNER, OF SAN FRANCISCO, CALIFORNIA, TRUSTEES.

FILTER-PRESS.

SPECIFICATION forming part of Letters Patent No. 652,588, dated June 26, 1900.

Application filed November 15, 1899. Serial No. 737,140. (No model.)

To ctZZ whom it may concern:

Be it known that I, MATTHEW P. BOAG, a subject of the Queen of Great Britain, residing at Golden Gate, in the county of Alameda and State of California, have invented certain new and useful Improvements in Filter- Presses, of which the following is a specification.

The object of my invention is to provide a filter-press specially adapted for filtering such slimy solutions as are obtained by the treatment of clayey ores by the cyanid or other leaching process of recovering precious metals. For filling a filter-press with such prod ucts pumps areunsuitable, because the valves of the pump soon become clogged up on account of the high proportion of solid matter suspended in the solutions.

My invention therefore contemplates the employment of gravity to fill the press and the subsequent employment of steam or air pressure to force the valuable solution through the filtering-cloths and free it from the solid matter.

My invention therefore comprises means for distributing the products with the greatest practical uniformity through the several filtering-divisions of the press in filling the same.

My invention also comprises means for rapidly filling the press with such products.

My invention also comprises means for washing the residual solids after the greater part of the valuable solutions have been obtained therefrom by the first expression in order to completely extract the remainder of the valuable solution.

In the accompanying drawings, Figure l is a side elevation of my improved filter-press. Fig. 2 is a longitudinal vertical section. Fig. 3 is an enlarged transverse vertical section, parts being broken away in succession. Fig. A is a still more enlarged partial longitudinal vertical section to show in detail a plate and filtering-webs, and Fig. 5 is a detail to show the construction of the automatic valves.

Referring to the drawings, 1 represents the base of the press, upon which are supported the stationary head 2 at one end and the movable head 3 at the other end, moved by the clamp'screw 4, and between which heads the sections of the filter-press are clamped. Said sections comprise plates 5 and rings 6, alternating with each other and having lugs 7 at their sides, resting on longitudinal guides 8. Said plates and rings have each an upward extension 9, which is cylindrically bored, as at 10, said apertures fitting end to end to form a continuous conduit. Into one end of this conduit leads a pipe 11 from a reservoir 12, containing the slimy solution. When this has been conducted into the conduit 10, as by opening a valve 13, it flows from said conduit into the chambers 14: within therings 6 through orifices 15 until all of said chambers are filled in succession. A valve 16 is now opened in a steam-pipe 17, leading by a tlexi ble hose 18 into the other end of the conduit 10, and steam is admitted into said conduit 10 in the opposite direction to the fiow of the slimy solution thereinto. The first result of this admission of steam will be to force back all of the slimy solution out of the channel 10 in the direction of the reservoir 12. As soon as the channel 10 is cleared of the slimy liquid the valve 13 is closed. This causes the pressure of the steam to be directed into the chambers 14:, and by reason of the channel 10 being perfectly clear of liquid the steam has equal access to all of said chambers and acts uniformly therein. The pressure of the steam in the chambers 14 forces the solution through filtering-disks 19, of canvas or other suitable material, one of which disks is clamped between each ring and the adjacent face of each adjoining plate, said faces having small channels 20, down which the clear solution flows and out through pipes 21, formed on the plates 5, intoatrough 22. The solids are left behind in the chambers 14 in the form of cakes. By providing a separate pipe for each section of the filterpress any imperfection of a filtering-disk will be at once detected by reason of the turbidity of the solution discharged from the 5 corresponding pipe 21. After the solution has been fully expressed the valve 16 is closed and a valve 22 is opened in a pipe 23, leading from a vessel 24, containing clear cyanid solution or other leaching liquid, and into 100 2 was the conduit 10, replacing in the chambers 14 the liquid which has been filtered therefrom. It would be found if the filter were opened after the first expression of liquid that the residuum in the chambers 14 consisted of two cakes still containing a small percentage of valuable solution, each lying against one of the disks 19, forming the walls of the chamber, there being a considerable empty space in the middle of the chamber intervening between the cakes. This space in the further treatment of the residuum is now filled with the liquid from the vessel 24. The valve 22 being now closed and the valve 16 opened, the steam-pressure forces the liquid through the cakes in the chamber 14, thus thoroughly washing the solids and extracting the valuable solutions therefrom. The clamp-screw t is now unscrewed, the head 3 moved rearwardly, the filtering-sections separated, the drycakes of solid matter removed, and the plates clamped together for the next operation.

In order to expedite the filling of the filterpress, I provide anejector 25, which when the" valve 13 has been closed and valves 26 27 opened will exhaust the air out of the chambersl t and create a vacuum therein. In conjunction with this mechanism each of the discharge pipes 21 is provided with a check-valve 28, which automatically closes the pipe against the admission of air'while permitting free egressof the clear solution in the subsequent expression thereof.

It will be understood that for the purposes of this invention air-pressure may be used in the place of steam and will be regarded as an equivalent thereof; also, that an air-pump may beused in the place of the ejector.

I claim- 1. In a filter-press, the combinationof ringsand channeled plates alternating with each other, filtering material, as cloth, interposed between each ring and the surfacesof the adjacent plates,- m'eansfor clamping said rings, plates,and material together,- individ ualpi-pes for conducting the filtered liquid from said plates, a conduit discharging by individual passages into the upper portion of the chambers'within the rings, a reservoir for the-unfiltered liquid connected with said conduit, a source of gaseous pressure likewise connected with said conduit, and valves for independently controlling said conncctions, substantially a's described.

2. In afi'lter-press, the'combination of rings and channeled piates' alternating with each other, filtering material as cloth, interposed between each ring and the-surfaces of the adjacent plates, means for clamping said rings, plates; and material together, means for conducting the filtered liquid from said plates, a-

arranged that the gaseous pressure may be utilized to return the liquid from said conduit to the reservoir, and valves for independently controlling said connections, substantially as described.

3. In a filter-press,the combination with the body of the press, of a conduit discharging into the upper portion thereof, a reservoir for the unfiltered liquid connected with said con duit, a source of gaseous pressure, and a di= rect connection therefrom to said conduit so arranged that the gaseous pressure may be utilized to return the liquid from said conduit to the reservoir, and valves for independently controlling said connection, substantially as described.

4. In a filter-press, the combination of rings and channeled plates alternating with each other, filtering material, ascloth, interposed between each ring and'the surfaces of the adjacent plates, means for clamping the rings,

plates and material together, individual pipes {chambers inthe same'direction, substan tially ;as described.

v 5. In a filter-press,- the combination, with the body of the press, of a conduit discharging ;into the upper portion thereof, a reservoir for the filtered liquid connected directly with one end of said conduit, and a source of gaseous ;-pressure connected directly with the oppo site end of said conduit, whereby the liquid and gas flow into said conduit in opposite directions, but from said conduit through said press in the same direction, substantially as described.

6. In a filter-press, the combination of rings and channeled plates alternating with each other, filtering material, as'cloth', interposed between each ring and the surfaces'of the ad- 1 jacentplates, means for clampingthe rings, 2 plates and material together, individ ual-pipes ,for conducting the filtered liquid from said plates, said plates and rings having apertured extensions upward therefrom, said apertures fitting end to end to formaconduit,

"the apertures-in the extensionsfrom the rings connecting by orifices with the chambers within the rings, a reservoir'for the unfiltered liquid connected with said conduit, means for recon'veying to said reservoir, after said ,press has been filled, the residual liquid in f 'said conduit, means for segregating from the l 'conduit the liquid so reconveyed, whereby an unobstructed passage is provided along the 'condui t,-and a source of gaseous pressure'con- ,nected directly with the conduit, substantially as described.

7. In a filter-press, the combination of rings states and channeled plates alternating with each other, filtering material, as cloth, interposed between each ring and the surfaces of the adjacent plates, means for clamping the rings, plates and material together, individual pipes for conducting the filtered liquid from said plates, a conduit discharging into the upper portion of the chambers within the rings, a reservoir for the unfiltered liquid connected with said conduit, means for reconveying to said reservoir, after said press has been filled therefrom, the residual liquid in said conduit, means for segregating from the conduit the liquid so reconveyed, whereby an unobstructed passage is provided along the conduit, and a source of gaseous pressure connected directly with the conduit, substantially as described.

8. In a filter-press, the combination, with the body of the press, of a conduit discharging into the upper portion thereof, a reservoir for the unfiltered liquid connected with said conduit, means for reconveying to said reservoir, after said press has been filled therefrom, the residual liquid in said conduit, means for segregating from the conduit the liquid so reconveyed, whereby an unobstructed passage is provided along the conduit, and a source of gaseous pressure connected directly with the conduit, substantially as described.

9. In a filter-press, the combination with the body of the press, of a reservoir for the unfiltered liquid connected with the press, a valve for controlling the fiow of said liquid into the press, and means for producing a vacuum in said press, whereby, when said valve is opened, the press is rapidly filled from the reservoir, substantially as described.

10. In a filter-press, the combination, with the body of the press, of a reservoir for the unfiltered liquid connected with the press, a valve for controlling the flow of said liquid into said press, a discharge-pipe for discharging the filtered liquid, an automatic checkvalve on said pipe preventing ingress of air, and means for exhausting the air from the press, substantially as described.

11. In a filter-press, the combination of rings and channeled plates alternating with each other, filtering material, as cloth, interposed between said ring and the surfaces of the adjacent plates, means for clamping said rings, plates, and material together, a reservoir for the unfiltered liquid connected with the chambers within the rings, a valve for cont-rolling the flow of the liquid into said chambers, individual pipes for discharging the filtered liquid from the plates, an automatic check-valve on each pipe preventing the ingress of air, and means for exhausting the air from said chambers, substantially as described.

12. In a filter-press, the combination of rings and channeled plates alternating with each other, filtering material, as cloth, interposed between each ring and the surfaces of the adjacent plates, means for clamping the rings,plates and material together, said plates and rings having upward apertured extensions, said apertures fitting end to end to form a conduit, the apertures in the extensions from the rings being connected by orifices with the chambers within the rings, a reservoir for the unfiltered liquid connected with the press, a valve for controlling the fiovv of said liquid into said press, individual pipes for discharging the filtered liquid from the plates, an automatic check-valve on each such pipe preventing the ingress of air, and an exhaust device connected with said conduit for exhausting the air from said chambers, substantially as described.

13. In a filter-press, the combination, with the body of the press, of a conduit leading into the upper portion thereof, two reservoirs connected to one end of said conduit, valves for independently controlling the flowof liquid from said reservoirs to the conduit, and a source of gaseous pressure connected with the other end of the conduit, substantially as described.

14. In a filter-press, the combination of rings and channeled plates alternating with each other, filtering material, as cloth, interposed between each ring and the surfaces of the adjacent plates, means for clamping the rings, plates and material together, said plates and rings having upward apertured extensions, said apertures fitting end to end to form a conduit, theapertures in the extensions from the rings connecting by orifices with the chambers within the rings, a reservoir for the unfiltered liquid connected with one end of the conduit, a reservoir for washingliquid also connected with said end, valves for independently controlling the connections from said reservoirs, and a source of gaseous pressure likewise connected with said conduit, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses.

MATTHEW P. BOAG. [L. s] 

